lua_settable(L, objectstable);
}
-bool scriptapi_on_chat_message(lua_State *L, const std::string &name,
- const std::string &message)
+/*
+ misc
+*/
+
+// What scriptapi_run_callbacks does with the return values of callbacks.
+// Regardless of the mode, if only one callback is defined,
+// its return value is the total return value.
+// Modes only affect the case where 0 or >= 2 callbacks are defined.
+enum RunCallbacksMode
{
- realitycheck(L);
- assert(lua_checkstack(L, 20));
- StackUnroller stack_unroller(L);
+ // Returns the return value of the first callback
+ // Returns nil if list of callbacks is empty
+ RUN_CALLBACKS_MODE_FIRST,
+ // Returns the return value of the last callback
+ // Returns nil if list of callbacks is empty
+ RUN_CALLBACKS_MODE_LAST,
+ // If any callback returns a false value, the first such is returned
+ // Otherwise, the first callback's return value (trueish) is returned
+ // Returns true if list of callbacks is empty
+ RUN_CALLBACKS_MODE_AND,
+ // Like above, but stops calling callbacks (short circuit)
+ // after seeing the first false value
+ RUN_CALLBACKS_MODE_AND_SC,
+ // If any callback returns a true value, the first such is returned
+ // Otherwise, the first callback's return value (falseish) is returned
+ // Returns false if list of callbacks is empty
+ RUN_CALLBACKS_MODE_OR,
+ // Like above, but stops calling callbacks (short circuit)
+ // after seeing the first true value
+ RUN_CALLBACKS_MODE_OR_SC,
+ // Note: "a true value" and "a false value" refer to values that
+ // are converted by lua_toboolean to true or false, respectively.
+};
+
+// Push the list of callbacks (a lua table).
+// Then push nargs arguments.
+// Then call this function, which
+// - runs the callbacks
+// - removes the table and arguments from the lua stack
+// - pushes the return value, computed depending on mode
+static void scriptapi_run_callbacks(lua_State *L, int nargs,
+ RunCallbacksMode mode)
+{
+ // Insert the return value into the lua stack, below the table
+ assert(lua_gettop(L) >= nargs + 1);
+ lua_pushnil(L);
+ lua_insert(L, -(nargs + 1) - 1);
+ // Stack now looks like this:
+ // ... <return value = nil> <table> <arg#1> <arg#2> ... <arg#n>
+
+ int rv = lua_gettop(L) - nargs - 1;
+ int table = rv + 1;
+ int arg = table + 1;
+
+ luaL_checktype(L, table, LUA_TTABLE);
- // Get minetest.registered_on_chat_messages
- lua_getglobal(L, "minetest");
- lua_getfield(L, -1, "registered_on_chat_messages");
- luaL_checktype(L, -1, LUA_TTABLE);
- int table = lua_gettop(L);
// Foreach
lua_pushnil(L);
+ bool first_loop = true;
while(lua_next(L, table) != 0){
// key at index -2 and value at index -1
luaL_checktype(L, -1, LUA_TFUNCTION);
// Call function
- lua_pushstring(L, name.c_str());
- lua_pushstring(L, message.c_str());
- if(lua_pcall(L, 2, 1, 0))
+ for(int i = 0; i < nargs; i++)
+ lua_pushvalue(L, arg+i);
+ if(lua_pcall(L, nargs, 1, 0))
script_error(L, "error: %s", lua_tostring(L, -1));
- bool ate = lua_toboolean(L, -1);
- lua_pop(L, 1);
- if(ate)
- return true;
+
+ // Move return value to designated space in stack
+ // Or pop it
+ if(first_loop){
+ // Result of first callback is always moved
+ lua_replace(L, rv);
+ first_loop = false;
+ } else {
+ // Otherwise, what happens depends on the mode
+ if(mode == RUN_CALLBACKS_MODE_FIRST)
+ lua_pop(L, 1);
+ else if(mode == RUN_CALLBACKS_MODE_LAST)
+ lua_replace(L, rv);
+ else if(mode == RUN_CALLBACKS_MODE_AND ||
+ mode == RUN_CALLBACKS_MODE_AND_SC){
+ if(lua_toboolean(L, rv) == true &&
+ lua_toboolean(L, -1) == false)
+ lua_replace(L, rv);
+ else
+ lua_pop(L, 1);
+ }
+ else if(mode == RUN_CALLBACKS_MODE_OR ||
+ mode == RUN_CALLBACKS_MODE_OR_SC){
+ if(lua_toboolean(L, rv) == false &&
+ lua_toboolean(L, -1) == true)
+ lua_replace(L, rv);
+ else
+ lua_pop(L, 1);
+ }
+ else
+ assert(0);
+ }
+
+ // Handle short circuit modes
+ if(mode == RUN_CALLBACKS_MODE_AND_SC &&
+ lua_toboolean(L, rv) == false)
+ break;
+ else if(mode == RUN_CALLBACKS_MODE_OR_SC &&
+ lua_toboolean(L, rv) == true)
+ break;
+
// value removed, keep key for next iteration
}
- return false;
+
+ // Remove stuff from stack, leaving only the return value
+ lua_settop(L, rv);
+
+ // Fix return value in case no callbacks were called
+ if(first_loop){
+ if(mode == RUN_CALLBACKS_MODE_AND ||
+ mode == RUN_CALLBACKS_MODE_AND_SC){
+ lua_pop(L, 1);
+ lua_pushboolean(L, true);
+ }
+ else if(mode == RUN_CALLBACKS_MODE_OR ||
+ mode == RUN_CALLBACKS_MODE_OR_SC){
+ lua_pop(L, 1);
+ lua_pushboolean(L, false);
+ }
+ }
}
-/*
- misc
-*/
+bool scriptapi_on_chat_message(lua_State *L, const std::string &name,
+ const std::string &message)
+{
+ realitycheck(L);
+ assert(lua_checkstack(L, 20));
+ StackUnroller stack_unroller(L);
+
+ // Get minetest.registered_on_chat_messages
+ lua_getglobal(L, "minetest");
+ lua_getfield(L, -1, "registered_on_chat_messages");
+ // Call callbacks
+ lua_pushstring(L, name.c_str());
+ lua_pushstring(L, message.c_str());
+ scriptapi_run_callbacks(L, 2, RUN_CALLBACKS_MODE_OR_SC);
+ bool ate = lua_toboolean(L, -1);
+ return ate;
+}
void scriptapi_on_newplayer(lua_State *L, ServerActiveObject *player)
{
// Get minetest.registered_on_newplayers
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "registered_on_newplayers");
- luaL_checktype(L, -1, LUA_TTABLE);
- int table = lua_gettop(L);
- // Foreach
- lua_pushnil(L);
- while(lua_next(L, table) != 0){
- // key at index -2 and value at index -1
- luaL_checktype(L, -1, LUA_TFUNCTION);
- // Call function
- objectref_get_or_create(L, player);
- if(lua_pcall(L, 1, 0, 0))
- script_error(L, "error: %s", lua_tostring(L, -1));
- // value removed, keep key for next iteration
- }
+ // Call callbacks
+ objectref_get_or_create(L, player);
+ scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
}
void scriptapi_on_dieplayer(lua_State *L, ServerActiveObject *player)
{
- realitycheck(L);
- assert(lua_checkstack(L, 20));
- StackUnroller stack_unroller(L);
-
- // Get minetest.registered_on_dieplayers
- lua_getglobal(L, "minetest");
- lua_getfield(L, -1, "registered_on_dieplayers");
- luaL_checktype(L, -1, LUA_TTABLE);
- int table = lua_gettop(L);
- // Foreach
- lua_pushnil(L);
- while(lua_next(L, table) != 0){
- // key at index -2 and value at index -1
- luaL_checktype(L, -1, LUA_TFUNCTION);
- // Call function
- objectref_get_or_create(L, player);
- if(lua_pcall(L, 1, 0, 0))
- script_error(L, "error: %s", lua_tostring(L, -1));
- // value removed, keep key for next iteration
- }
-}
+ realitycheck(L);
+ assert(lua_checkstack(L, 20));
+ StackUnroller stack_unroller(L);
+ // Get minetest.registered_on_dieplayers
+ lua_getglobal(L, "minetest");
+ lua_getfield(L, -1, "registered_on_dieplayers");
+ // Call callbacks
+ objectref_get_or_create(L, player);
+ scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
+}
bool scriptapi_on_respawnplayer(lua_State *L, ServerActiveObject *player)
{
assert(lua_checkstack(L, 20));
StackUnroller stack_unroller(L);
- bool positioning_handled_by_some = false;
-
// Get minetest.registered_on_respawnplayers
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "registered_on_respawnplayers");
- luaL_checktype(L, -1, LUA_TTABLE);
- int table = lua_gettop(L);
- // Foreach
- lua_pushnil(L);
- while(lua_next(L, table) != 0){
- // key at index -2 and value at index -1
- luaL_checktype(L, -1, LUA_TFUNCTION);
- // Call function
- objectref_get_or_create(L, player);
- if(lua_pcall(L, 1, 1, 0))
- script_error(L, "error: %s", lua_tostring(L, -1));
- bool positioning_handled = lua_toboolean(L, -1);
- lua_pop(L, 1);
- if(positioning_handled)
- positioning_handled_by_some = true;
- // value removed, keep key for next iteration
- }
+ // Call callbacks
+ objectref_get_or_create(L, player);
+ scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_OR);
+ bool positioning_handled_by_some = lua_toboolean(L, -1);
return positioning_handled_by_some;
}
+void scriptapi_on_joinplayer(lua_State *L, ServerActiveObject *player)
+{
+ realitycheck(L);
+ assert(lua_checkstack(L, 20));
+ StackUnroller stack_unroller(L);
+
+ // Get minetest.registered_on_joinplayers
+ lua_getglobal(L, "minetest");
+ lua_getfield(L, -1, "registered_on_joinplayers");
+ // Call callbacks
+ objectref_get_or_create(L, player);
+ scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
+}
+
+void scriptapi_on_leaveplayer(lua_State *L, ServerActiveObject *player)
+{
+ realitycheck(L);
+ assert(lua_checkstack(L, 20));
+ StackUnroller stack_unroller(L);
+
+ // Get minetest.registered_on_leaveplayers
+ lua_getglobal(L, "minetest");
+ lua_getfield(L, -1, "registered_on_leaveplayers");
+ // Call callbacks
+ objectref_get_or_create(L, player);
+ scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
+}
+
void scriptapi_get_creative_inventory(lua_State *L, ServerActiveObject *player)
{
Inventory *inv = player->getInventory();
// Get minetest.registered_globalsteps
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "registered_globalsteps");
- luaL_checktype(L, -1, LUA_TTABLE);
- int table = lua_gettop(L);
- // Foreach
- lua_pushnil(L);
- while(lua_next(L, table) != 0){
- // key at index -2 and value at index -1
- luaL_checktype(L, -1, LUA_TFUNCTION);
- // Call function
- lua_pushnumber(L, dtime);
- if(lua_pcall(L, 1, 0, 0))
- script_error(L, "error: %s", lua_tostring(L, -1));
- // value removed, keep key for next iteration
- }
+ // Call callbacks
+ lua_pushnumber(L, dtime);
+ scriptapi_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
}
void scriptapi_environment_on_generated(lua_State *L, v3s16 minp, v3s16 maxp,
// Get minetest.registered_on_generateds
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "registered_on_generateds");
- luaL_checktype(L, -1, LUA_TTABLE);
- int table = lua_gettop(L);
- // Foreach
- lua_pushnil(L);
- while(lua_next(L, table) != 0){
- // key at index -2 and value at index -1
- luaL_checktype(L, -1, LUA_TFUNCTION);
- // Call function
- push_v3s16(L, minp);
- push_v3s16(L, maxp);
- lua_pushnumber(L, blockseed);
- if(lua_pcall(L, 3, 0, 0))
- script_error(L, "error: %s", lua_tostring(L, -1));
- // value removed, keep key for next iteration
- }
+ // Call callbacks
+ push_v3s16(L, minp);
+ push_v3s16(L, maxp);
+ lua_pushnumber(L, blockseed);
+ scriptapi_run_callbacks(L, 3, RUN_CALLBACKS_MODE_FIRST);
}
/*
projects / oweals / minetest.git / commitdiff